Device for recycling electrolytic copper from electrolytic copper foil production waste liquid

Abstract

The utility model discloses a device for recycling electrolytic copper from electrolytic copper foil production waste liquid, which comprises a plurality of stages of electrolytic baths, the electrolytic baths are sequentially connected to form a series stepped electrolytic system, and each electrolytic bath is connected to an acid mist treatment system; the first-stage electrolytic cell is connected with a waste liquid system through a liquid supply pump and a filtering system, and the last-stage electrolytic cell is connected with a concentration filtering system to form a final concentration filtering structure for electrolyte; each stage of electrolytic bath before the last stage of electrolytic bath is connected with a power supply and a circulating filtration system consisting of a circulating pump and a filter; and the circulating filtration system is connected with the corresponding electrolytic bath to form a circulating structure. The device not only recovers copper, but also recycles the waste liquid generated in the production of the electrolytic copper foil, so that economic benefits are obtained, and environmental pollution is avoided. The whole device is simple and reasonable in structure, various materials do not need to be frequently transferred, the treatment process is simplified, the treatment time is shortened, and the treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic copper foil production equipment, in particular to an electrolytic copper device capable of realizing the recycling and regeneration of waste liquid in electrolytic copper foil production. Background Art

[0002] During the production process of electrolytic copper foil, a large amount of copper sulfate waste liquid and crystals are generated. This waste liquid contains copper (copper content is about 15 - 30 g / L) and various additives. At present, for this production waste liquid, in the production systems of some domestic and foreign electrolytic copper foil manufacturing enterprises, the waste liquid passes through a pipeline mixer, and NaOH is added to form a colloidal flocculent substance of metal (Cu) hydroxide. PAC (poly aluminum chloride) and PAM (polyacrylamide) are added to flocculate small molecules into large particles for sedimentation. It enters a vortex reactor for reaction and sedimentation, and the clear water enters a sedimentation tank for further sedimentation, where the sediment and the solution are separated in the sedimentation tank. The sludge from the vortex reactor and the sedimentation tank is discharged into a sludge tank, preliminarily concentrated in the sludge tank, and then filtered by a filter press into a mud cake, which is then transported to a recycling enterprise. The recycling enterprise uses it as raw material to produce copper sulfate products, but a large amount of the liquid containing additives has not been effectively treated, which will cause environmental pollution and waste of resources, and has no benefit for electrolytic copper foil production enterprises. And for the few solutions that can comprehensively treat the liquid containing additives and recycle copper, they generally operate through the cooperation of different treatment systems, which results in high equipment costs and cumbersome treatment processes. Since various materials and waste liquids need to be frequently transported, it is time-consuming and laborious. Summary of the Utility Model

[0003] Aiming at the shortcomings of the prior art, the utility model provides an electrolytic copper device for recycling and regenerating waste liquid in electrolytic copper foil production, which has a simpler structure, more reasonable design, can simplify the treatment process, reduce the treatment time, and lower the treatment cost.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: An electrolytic copper device for recycling and regenerating waste liquid in electrolytic copper foil production includes several stages of electrolytic cells. Each stage of electrolytic cells is connected in sequence to form a series-connected stepped electrolytic system, and each electrolytic cell is connected to an acid mist treatment system; the first-stage electrolytic cell is connected to the waste liquid system through a liquid supply pump and a filtration system, and the last-stage electrolytic cell is connected to a concentration and filtration system to form a final concentration and filtration structure for the electrolytic solution; each stage of electrolytic cell before the last-stage electrolytic cell is connected to a power supply and a circulation and filtration system composed of a circulation pump and a filter. The circulation and filtration system is connected to the corresponding electrolytic cell to form a circulation structure, which is used to filter the lead mud in the electrolytic solution and stir and mix the electrolytic solution to keep its concentration balanced and the electrolytic solution clean.

[0005] Further, the electrolytic cell includes five levels. The first-level electrolytic cell is connected to the waste liquid system, and the fifth-level electrolytic cell is connected to the concentration and filtration system. The first, second, third, and fourth-level electrolytic cells are all connected to a circulation and filtration system.

[0006] Further, the first and second-level electrolytic cells share a set of power supply, the third and fourth-level electrolytic cells share a set of power supply, and the five groups of electrolytic cells use a set of power supply separately.

[0007] Further, the concentration and filtration system includes an activated carbon filtration device and a precision filter, and the precision filter is connected to the activated carbon filtration device.

[0008] Further, the fifth-level electrolytic cell is connected to a lean copper storage tank, and the lean copper storage tank is connected to the activated carbon filtration device through a lift pump.

[0009] Further, the waste liquid system includes a stirring tank and a waste liquid storage tank. The stirring tank is connected to the waste liquid storage tank, and the filtration system between the waste liquid storage tank and the liquid supply pump uses a precision filter with a filtration accuracy of 10 μm.

[0010] Further, the power supply connected to the first and second-level electrolytic cells uses a 5KA / 9V power supply, the power supply connected to the third and fourth-level electrolytic cells uses a 3.5KA / 9V power supply, and the power supply connected to the fifth-level electrolytic cell uses a 3KA / 9V power supply.

[0011] Further, the fifth-level electrolytic cells operate in series. 28 anodes in each level are connected in parallel, and there are 140 anodes made of lead-calcium-tin material in total for the fifth-level electrolytic cells; the maximum working current of each anode is 500A, the average cell voltage of a single group is about 2.2 volts, and the sum of the electrolytic currents of each anode plate in the fifth-level electrolytic cell is A = 53.5KA; the effective working area of the cathode sheet is 820mm×680mm, with double-sided electroplating. The working current densities are 250A / ㎡ for the first and second-level electrolytic cells, 178A / ㎡ for the third and fourth-level electrolytic cells, and 143A / ㎡ for the fifth-level electrolytic cells. The distance between the anode and the cathode is 80mm.

[0012] The present utility model adopts a five-level electrolytic cell. The filtered copper sulfate solution enters the first-level electrolytic cell for electrolysis. After the electrolysis of the first level is completed, it flows into the second, third, fourth, and fifth levels in sequence by gravity. The concentration of the electrolyte decreases after electrolysis in each cell. After the electrolysis is completed, the residual liquid flows into the lean copper storage tank by gravity. The lean copper sulfate solution is lifted by a corrosion-resistant pump and then enters the activated carbon filtration device and the precision filter. After filtration and adsorption, it is sent to the concentration and reverse osmosis system for re-concentration and utilization, and finally the copper concentration is reduced to less than 0.5g / L. In this way, not only copper is recovered, but also the waste liquid generated in the production of electrolytic copper foil is recycled, achieving economic benefits and avoiding environmental pollution. At the same time, the structure of the whole device is simpler and more reasonable, without the need to frequently transfer various materials, simplifying the treatment process, reducing the treatment time, and lowering the treatment cost. Description of the Drawings

[0013] Figure 1 This is a schematic structural diagram of the present utility model. Specific embodiments

[0014] In this embodiment, referring to Figure 1 , the electrolytic copper foil production waste liquid recycling and regenerating electrolytic copper device includes several stages of electrolytic cells. Each stage of electrolytic cells is connected in sequence to form a series-connected stepped electrolytic system, and each electrolytic cell is connected to an acid mist treatment system (acid mist purification tower); the first-stage electrolytic cell is connected to the waste liquid system through a liquid supply pump and a filtration system, and the last-stage electrolytic cell is connected to a concentration and filtration system to form a final concentration and filtration structure for the electrolytic solution; each electrolytic cell before the last-stage electrolytic cell is connected to a power supply and a circulation and filtration system composed of a circulation pump and a filter. The circulation and filtration system is connected to the corresponding electrolytic cell to form a circulation structure for filtering lead mud in the electrolytic solution and stirring and mixing the electrolytic solution to maintain the balance of its concentration and the cleanliness of the electrolytic solution.

[0015] The electrolytic cell includes five stages. The first-stage electrolytic cell is connected to the waste liquid system, and the fifth-stage electrolytic cell is connected to the concentration and filtration system. The first, second, third, and fourth-stage electrolytic cells are all connected to a circulation and filtration system.

[0016] The first and second-stage electrolytic cells share a set of power supplies, the third and fourth-stage electrolytic cells share a set of power supplies, and the five groups of electrolytic cells use a set of power supplies separately.

[0017] The concentration and filtration system includes an activated carbon filtration device and a precision filter, and the precision filter is connected to the activated carbon filtration device.

[0018] The fifth-stage electrolytic cell is connected to a lean copper storage tank, and the lean copper storage tank is connected to the activated carbon filtration device through a lifting pump.

[0019] The waste liquid system includes a stirring tank and a waste liquid storage tank. The stirring tank is connected to the waste liquid storage tank, and the filtration system between the waste liquid storage tank and the liquid supply pump uses a precision filter with a filtration accuracy of 10 μm.

[0020] The power supplies connected to the first and second-stage electrolytic cells use a 5KA / 9V power supply, the power supplies connected to the third and fourth-stage electrolytic cells use a 3.5KA / 9V power supply, and the power supply connected to the fifth-stage electrolytic cell uses a 3KA / 9V power supply.

[0021] Five-stage electrolytic cells (specification: 4800L×1300W×1100H, material: non-toxic PVC) are connected in series. In each stage, 28 anodes of the electrolytic cells are connected in parallel, and there are a total of 140 anodes made of lead-calcium-tin in the five-stage electrolytic cells; the maximum working current of each anode is 500A, the average cell voltage of a single group is about 2.2V, and the sum of the electrolytic currents of the anode plates in the five-stage electrolytic cells is A = 53.5KA; the effective working area of the cathode sheet is 820mm×680mm, with double-sided electroplating. The working current densities are 250A / ㎡ for the first and second stages of electrolytic cells, 178A / ㎡ for the third and fourth stages of electrolytic cells, and 143A / ㎡ for the fifth stage of electrolytic cells. The distance between the anode and the cathode is 80mm.

[0022] The waste liquid and copper sulfate crystals are fully dissolved after stirring and then enter the waste liquid storage tank, and are lifted by a corrosion-resistant pump into a precision filter (filtering accuracy 10μm). The filtered copper sulfate solution enters the first-stage electrolytic cell (flow rate 3m 3 / h, copper content ≥ 15g / L) for electrolysis. After the first-stage electrolysis is completed, it flows by gravity into the second stage, the third stage, the fourth stage, and the fifth stage in sequence. The electrolysis time for each stage is 1.15 hours, and the total electrolysis time is 5.75 hours. The concentration of the electrolyte decreases after electrolysis in each cell. The concentration of the copper sulfate solution in each electrolytic cell is different, and its current density is also different. Each electrolytic cell is equipped with a precision filter and a corrosion-resistant circulating pump. Through circulation, the lead mud in the electrolyte can be filtered and the electrolyte can be stirred and mixed to keep its concentration balanced and the electrolyte clean. The residual liquid after electrolysis flows by gravity into the lean copper storage tank. The lean copper sulfate solution is lifted by a corrosion-resistant pump and then enters the activated carbon filtration device and the precision filter. After filtration and adsorption, it is sent to the concentration reverse osmosis system for re-concentration and utilization. The copper concentration after electrolysis in the last cell is lower than 0.5g / L. During operation, if it is monitored that the temperature of the electrolyte is too high (greater than 40 degrees Celsius), it needs to be sent to a vortex cooling tower for cooling treatment by the circulating pump.

[0023] The above has made a detailed description of the present utility model. As described above, it is only a preferred embodiment of the present utility model, and the scope of implementation of the present utility model cannot be limited. That is, all equivalent changes and modifications made according to the scope of this application should still fall within the scope covered by the present utility model.

Claims

1. A device for recycling electrolytic copper from waste liquid produced by electrolytic copper foil, characterized in that: The invention comprises several stages of electrolytic cells, which are connected in sequence to form a series-connected stepped electrolytic system, and each electrolytic cell is connected to an acid mist treatment system; the first-stage electrolytic cell is connected to a waste liquid system via a liquid supply pump and a filtering system, and the last-stage electrolytic cell is connected to a concentration filtering system to form a final concentration filtering structure for the electrolyte; the electrolytic cells of each stage before the last-stage electrolytic cell are connected to a power supply and a circulation filtering system consisting of a circulation pump and a filter, and the circulation filtering system is connected to the corresponding electrolytic cell to form a circulation structure.

2. The device for recycling electrolytic copper from wastewater produced by electrolytic copper foil according to claim 1, characterized in that: The electrolytic cell comprises five stages, the first stage electrolytic cell is connected to the waste liquid system, the fifth stage electrolytic cell is connected to the concentration and filtration system, and the first, second, third and fourth stage electrolytic cells are all connected to the circulation and filtration system.

3. The device for recycling electrolytic copper from wastewater produced by electrolytic copper foil according to claim 2, characterized in that: The first and second level electrolytic cells share a set of power supply, the third and fourth level electrolytic cells share a set of power supply, and the fifth group of electrolytic cells uses a separate set of power supply.

4. The device for recycling electrolytic copper from wastewater produced by electrolytic copper foil according to claim 2, characterized in that: The concentration and filtration system comprises an activated carbon filtration device and a precision filter, and the precision filter is connected to the activated carbon filtration device.

5. The device for recycling electrolytic copper from waste liquid produced by electrolytic copper foil according to claim 4, characterized in that: The five-stage electrolytic cell is connected to a lean copper liquid storage tank, and the lean copper liquid storage tank is connected to an activated carbon filtering device through a lifting pump.

6. The device for recycling electrolytic copper from waste liquid produced by electrolytic copper foil according to claim 2, characterized in that: The waste liquid system includes a stirring tank and a waste liquid storage tank. The stirring tank is connected to the waste liquid storage tank. The filtration system between the waste liquid storage tank and the liquid supply pump adopts a precision filter with a filtration accuracy of 10μm.

7. The device for recycling electrolytic copper from wastewater produced by electrolytic copper foil according to claim 3, characterized in that: The power supply connected to the first and second level electrolytic cells adopts 5KA / 9V power supply, the power supply connected to the third and fourth level electrolytic cells adopts 3.5KA / 9V power supply, and the power supply connected to the fifth level electrolytic cell adopts 3KA / 9V power supply.

8. The device for recycling electrolytic copper from wastewater produced by electrolytic copper foil according to claim 2, characterized in that: The five-stage electrolytic cells are operated in series, with 28 groups of anodes connected in parallel in each stage, and a total of 140 groups of lead-calcium-tin anodes in the five-stage electrolytic cells; the maximum working current of each anode is 500A, the average cell voltage of a single group is about 2.2 volts, and the sum of the electrolytic currents of each anode plate in the five-stage electrolytic cell is A=53.5KA; the effective working area of ​​the cathode plate is 820mm×680mm, double-sided electroplating, the working current density is 250A / ㎡ for the first and second stage electrolytic cells, 178A / ㎡ for the third and fourth stage electrolytic cells, and 143A / ㎡ for the fifth stage electrolytic cell, and the cathode and anode distance is 80mm.

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